TC_LAB datasheet(8/29 Pages) WAVELENGTH

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OPERATING INSTRUCTIONS

WHAT’S IN THE BOX

• Temperature Controller Instrument

• Power Cable, type appropriate for final location

• 15 + 2 Male D-SUB plug and pins

• Two 3.15 A fuses are installed in the red fuse tray in the

power entry module on the back panel

• USB Flash Drive, includes instrument documentation and

LabVIEW Virtual Instrument

REQUIRED AND OPTIONAL

EQUIPMENT

FOR SET UP

• Test load (optional) OR

• Thermoelectric or Resistive Heater and temperature

sensor for feedback

COMPUTER REQUIREMENTS FOR

REMOTE OPERATION ONLY (OPTIONAL)

Operating System: Windows XP SP2 or later

ESD INFORMATION

Before proceeding, it is critical that you take precautions to

prevent electrostatic discharge (ESD) damage to the load.

ESD damage can result from improper handling of sensitive

electronics, and is easily preventable with simple precautions.

REMOTE OPERATION

The TC LAB can be controlled by a remote computer using

the Command Set (see the LAB Series Command Set User

Guide) or with a LabVIEW Virtual Instrument application (see

the Virtual Instrument User Guide).

THEORY OF OPERATION

The TC LAB Series are high-current temperature controllers

that deliver bidirectional current to Peltier Effect thermoelectric

coolers (TE), or unidirectional current to resistive heaters

(RH).

The fundamental operating principle is that the controller

adjusts the output drive current in order to change the

temperature of the sensor that is connected to the thermal

load. The goal is to make the sensor temperature match the

setpoint temperature, and then keep them equal in spite of

changes to ambient conditions and variations in thermal load.

While output is enabled, the controller continuously compares

the setpoint temperature and the actual sensor temperature.

If there is a difference between the two, the controller adjusts

the output current—thereby driving the TE or heater to heat or

cool—until the difference is zero.

The controller includes features that help protect the load

from damage, and also make it more versatile in a wide array

of applications.

Current Limits: The adjustable current limits must be set

correctly in order to avoid over-driving and damaging the TE

or heater.

Control Loop: The controller employs a smart Proportional-

Integral-Derivative control loop to adjust the drive current. The

terms are user-adjustable and, when properly configured, will

quickly settle the load temperature with minimal overshoot

and ringing.

Voltage Limit: The voltage to the TE can be limited through

remote commands.

Temperature Limits: Set high and low temperature limits to

either report an over temperature condition at the load or use

them to trigger a Shutdown signal to turn off a Laser Diode /

QCL or other device driver to eliminate the active heat load

and protect the device. Additionally, if temperature limits are

exceeded, TE current will be disabled.

Sensor Disconnect/Failure Protection: If a short or open

circuit is detected at the sensor, the output current is disabled.

TE Failure Protection: If a short is detected across the

thermoelectric, the output current is also disabled.

IntelliTune: Wavelength’s proprietary algorithm characterizes

the TE / Sensor system’s response to the TC LAB temperature

controller and determines the optimal PID control coefficients.

Then it automatically adjusts the PID control values as

setpoint, tuning mode, or bias current are changed.

These instructions are for operating the TC LAB Series

instrument. Fuses are provided and installed. We recommend

using a test load until you are familiar with operation of the

instrument.

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